VSC-HVDC System Modeling and Validation
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
The performance of traditionally used converter control strategies dependson the ac system conditions. Particularly, the ac system strength is a limitingfactor for converter controls to perform well. This work is motivated bythe rapid proliferation of high-voltage dc technology, which enables dierentcontrol structures to be simulated using dierent simulation tools. The rstpart of this thesis investigates a generic converter control model on dierentsimulation platforms and implementations. The second part exploits theabove-mentioned limiting factor for converter controls to perform well.In this thesis, a control implementation is tailored to replicate the be-havior of another control implementation on dierent software. In orderto ensure that software implementations not become alienated from reality,comparisons to a manufacturer's black-box are also carried out. Furthermore,this thesis demonstrates how many converter stations are linked together bya dc transmission network. A previously proposed control method, power-synchronization control, has been demonstrated to perform well on a point-to-point high-voltage direct current link in connection to a weak ac system.In this thesis, the potential of power-synchronization control is demonstratedin a multi-terminal dc grid with one very weak ac system connection.
Place, publisher, year, edition, pages
2014. , 133 p.
EES Examensarbete / Master Thesis
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-142619OAI: oai:DiVA.org:kth-142619DiVA: diva2:703665
Subject / course
Electric Power Systems
Master of Science in Engineering -Engineering Physics
Li, Wei, Ph.D. candidate
Vanfretti, Luigi, Associate Professor